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PM: OMAP3: Removed a couple of unused variables from DVFS code
[linux-ginger.git] / drivers / crypto / padlock-sha.c
blob76cb6b345e7b4a732e99f1c86b8dfc175a64cb52
1 /*
2 * Cryptographic API.
3 *
4 * Support for VIA PadLock hardware crypto engine.
5 *
6 * Copyright (c) 2006 Michal Ludvig <michal@logix.cz>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14
15 #include <crypto/internal/hash.h>
16 #include <crypto/sha.h>
17 #include <linux/err.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
23 #include <linux/scatterlist.h>
24 #include <asm/i387.h>
25 #include "padlock.h"
26
27 struct padlock_sha_desc {
28 struct shash_desc fallback;
29 };
30
31 struct padlock_sha_ctx {
32 struct crypto_shash *fallback;
33 };
34
35 static int padlock_sha_init(struct shash_desc *desc)
36 {
37 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
38 struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
39
40 dctx->fallback.tfm = ctx->fallback;
41 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
42 return crypto_shash_init(&dctx->fallback);
43 }
44
45 static int padlock_sha_update(struct shash_desc *desc,
46 const u8 *data, unsigned int length)
47 {
48 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
49
50 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
51 return crypto_shash_update(&dctx->fallback, data, length);
52 }
53
54 static inline void padlock_output_block(uint32_t *src,
55 uint32_t *dst, size_t count)
56 {
57 while (count--)
58 *dst++ = swab32(*src++);
59 }
60
61 static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
62 unsigned int count, u8 *out)
63 {
64 /* We can't store directly to *out as it may be unaligned. */
65 /* BTW Don't reduce the buffer size below 128 Bytes!
66 * PadLock microcode needs it that big. */
67 char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
68 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
69 struct sha1_state state;
70 unsigned int space;
71 unsigned int leftover;
72 int ts_state;
73 int err;
74
75 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
76 err = crypto_shash_export(&dctx->fallback, &state);
77 if (err)
78 goto out;
79
80 if (state.count + count > ULONG_MAX)
81 return crypto_shash_finup(&dctx->fallback, in, count, out);
82
83 leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
84 space = SHA1_BLOCK_SIZE - leftover;
85 if (space) {
86 if (count > space) {
87 err = crypto_shash_update(&dctx->fallback, in, space) ?:
88 crypto_shash_export(&dctx->fallback, &state);
89 if (err)
90 goto out;
91 count -= space;
92 in += space;
93 } else {
94 memcpy(state.buffer + leftover, in, count);
95 in = state.buffer;
96 count += leftover;
97 state.count &= ~(SHA1_BLOCK_SIZE - 1);
98 }
99 }
100
101 memcpy(result, &state.state, SHA1_DIGEST_SIZE);
102
103 /* prevent taking the spurious DNA fault with padlock. */
104 ts_state = irq_ts_save();
105 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
106 : \
107 : "c"((unsigned long)state.count + count), \
108 "a"((unsigned long)state.count), \
109 "S"(in), "D"(result));
110 irq_ts_restore(ts_state);
111
112 padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
113
114 out:
115 return err;
116 }
117
118 static int padlock_sha1_final(struct shash_desc *desc, u8 *out)
119 {
120 u8 buf[4];
121
122 return padlock_sha1_finup(desc, buf, 0, out);
123 }
124
125 static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in,
126 unsigned int count, u8 *out)
127 {
128 /* We can't store directly to *out as it may be unaligned. */
129 /* BTW Don't reduce the buffer size below 128 Bytes!
130 * PadLock microcode needs it that big. */
131 char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
132 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
133 struct sha256_state state;
134 unsigned int space;
135 unsigned int leftover;
136 int ts_state;
137 int err;
138
139 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
140 err = crypto_shash_export(&dctx->fallback, &state);
141 if (err)
142 goto out;
143
144 if (state.count + count > ULONG_MAX)
145 return crypto_shash_finup(&dctx->fallback, in, count, out);
146
147 leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
148 space = SHA256_BLOCK_SIZE - leftover;
149 if (space) {
150 if (count > space) {
151 err = crypto_shash_update(&dctx->fallback, in, space) ?:
152 crypto_shash_export(&dctx->fallback, &state);
153 if (err)
154 goto out;
155 count -= space;
156 in += space;
157 } else {
158 memcpy(state.buf + leftover, in, count);
159 in = state.buf;
160 count += leftover;
161 state.count &= ~(SHA1_BLOCK_SIZE - 1);
162 }
163 }
164
165 memcpy(result, &state.state, SHA256_DIGEST_SIZE);
166
167 /* prevent taking the spurious DNA fault with padlock. */
168 ts_state = irq_ts_save();
169 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
170 : \
171 : "c"((unsigned long)state.count + count), \
172 "a"((unsigned long)state.count), \
173 "S"(in), "D"(result));
174 irq_ts_restore(ts_state);
175
176 padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
177
178 out:
179 return err;
180 }
181
182 static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
183 {
184 u8 buf[4];
185
186 return padlock_sha256_finup(desc, buf, 0, out);
187 }
188
189 static int padlock_cra_init(struct crypto_tfm *tfm)
190 {
191 struct crypto_shash *hash = __crypto_shash_cast(tfm);
192 const char *fallback_driver_name = tfm->__crt_alg->cra_name;
193 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
194 struct crypto_shash *fallback_tfm;
195 int err = -ENOMEM;
196
197 /* Allocate a fallback and abort if it failed. */
198 fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
199 CRYPTO_ALG_NEED_FALLBACK);
200 if (IS_ERR(fallback_tfm)) {
201 printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
202 fallback_driver_name);
203 err = PTR_ERR(fallback_tfm);
204 goto out;
205 }
206
207 ctx->fallback = fallback_tfm;
208 hash->descsize += crypto_shash_descsize(fallback_tfm);
209 return 0;
210
211 out:
212 return err;
213 }
214
215 static void padlock_cra_exit(struct crypto_tfm *tfm)
216 {
217 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
218
219 crypto_free_shash(ctx->fallback);
220 }
221
222 static struct shash_alg sha1_alg = {
223 .digestsize = SHA1_DIGEST_SIZE,
224 .init = padlock_sha_init,
225 .update = padlock_sha_update,
226 .finup = padlock_sha1_finup,
227 .final = padlock_sha1_final,
228 .descsize = sizeof(struct padlock_sha_desc),
229 .base = {
230 .cra_name = "sha1",
231 .cra_driver_name = "sha1-padlock",
232 .cra_priority = PADLOCK_CRA_PRIORITY,
233 .cra_flags = CRYPTO_ALG_TYPE_SHASH |
234 CRYPTO_ALG_NEED_FALLBACK,
235 .cra_blocksize = SHA1_BLOCK_SIZE,
236 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
237 .cra_module = THIS_MODULE,
238 .cra_init = padlock_cra_init,
239 .cra_exit = padlock_cra_exit,
240 }
241 };
242
243 static struct shash_alg sha256_alg = {
244 .digestsize = SHA256_DIGEST_SIZE,
245 .init = padlock_sha_init,
246 .update = padlock_sha_update,
247 .finup = padlock_sha256_finup,
248 .final = padlock_sha256_final,
249 .descsize = sizeof(struct padlock_sha_desc),
250 .base = {
251 .cra_name = "sha256",
252 .cra_driver_name = "sha256-padlock",
253 .cra_priority = PADLOCK_CRA_PRIORITY,
254 .cra_flags = CRYPTO_ALG_TYPE_SHASH |
255 CRYPTO_ALG_NEED_FALLBACK,
256 .cra_blocksize = SHA256_BLOCK_SIZE,
257 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
258 .cra_module = THIS_MODULE,
259 .cra_init = padlock_cra_init,
260 .cra_exit = padlock_cra_exit,
261 }
262 };
263
264 static int __init padlock_init(void)
265 {
266 int rc = -ENODEV;
267
268 if (!cpu_has_phe) {
269 printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n");
270 return -ENODEV;
271 }
272
273 if (!cpu_has_phe_enabled) {
274 printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
275 return -ENODEV;
276 }
277
278 rc = crypto_register_shash(&sha1_alg);
279 if (rc)
280 goto out;
281
282 rc = crypto_register_shash(&sha256_alg);
283 if (rc)
284 goto out_unreg1;
285
286 printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
287
288 return 0;
289
290 out_unreg1:
291 crypto_unregister_shash(&sha1_alg);
292 out:
293 printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
294 return rc;
295 }
296
297 static void __exit padlock_fini(void)
298 {
299 crypto_unregister_shash(&sha1_alg);
300 crypto_unregister_shash(&sha256_alg);
301 }
302
303 module_init(padlock_init);
304 module_exit(padlock_fini);
305
306 MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
307 MODULE_LICENSE("GPL");
308 MODULE_AUTHOR("Michal Ludvig");
309
310 MODULE_ALIAS("sha1-all");
311 MODULE_ALIAS("sha256-all");
312 MODULE_ALIAS("sha1-padlock");
313 MODULE_ALIAS("sha256-padlock");
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